1a_Introduction

1a_Introduction - Psychological Statistics PSY 207A Fall...

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Psychological Statistics PSY 207A Fall 2010 Introduction Objectives
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You should be able to . . . • Defne statistics – and tell the diFFerence between descriptive and inferential statistics • Tell the diFFerence between populations and samples parameters and statistics You should be able to . . . • Defne data – and tell the diFFerence between qualitative and quantitative data – and tell the diFFerence between discrete and continuous data
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You should be able to . . . • Tell the difference between variables and constants independent and dependent variables control and experimental conditions experimental and correlational studies You should be able to . . . • DeFne the four scales of measurement and tell the difference among them: 1 . nominal 2. ordinal 3. interval 4. ratio
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Statistics • A set of tools used to organize, describe, and analyze numerical observations • These tools are used to describe and analyze numerical observations from populations and samples Populations and Samples Population • The set of all individuals of interest – depressed humans
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Populations and Samples Population • The set of all individuals of interest – depressed humans Populations and Samples Population • The set of all individuals of interest – depressed humans Sample • A subset of a population – those individuals in our research study
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Populations and Samples Population • The set of all individuals of interest – depressed humans Sample • A subset of a population – those individuals in our research study Populations and Samples • We use different terms to refer to the statistics used for populations and samples
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Parameter • A numerical description of a characteristic of a population – average # of hours of sleep for entire population of depressed individuals Statistic • A numerical description of a characteristic of a sample – average # of hours of sleep for those in our study Parameters and Statistics • The term statistics is used to refer to the whole set of tools we use to describe and analyze numerical observations • A statistic refers to a speciFc tool applied to samples – E.g., an average for a sample • A
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This note was uploaded on 08/22/2011 for the course PSY 207 taught by Professor Pfordesher during the Fall '07 term at SUNY Buffalo.

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1a_Introduction - Psychological Statistics PSY 207A Fall...

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